Presser-bar



H. F. CAMPBELL.

(No Model.)

PRESSER BAR.

N0. 395,380. Patented Jan. '1, 1889.

lJNiTEn STATES PATENT UEETEE.

HENRY F. CAMPBELL, OF MALDEN, MASSACHUSETTS.

PRESSER-BAR.

SPECIFICATION forming part of Letters Patent No. 395,380, dated January1, 1889.

Application filed March 27, 1888. $erial No. 268,623. (No model.)

To all 1071/0122 it may concern:

Be it known that I, HENRY F. CAMPBELL, of Maiden, county of Middlesex,State of Massachusetts, have invented an Improvement in Presser-Bars, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like letters on the drawin representinglike parts.

In wood-planing machines as now commonly built much difficulty isexperienced in passing under the presser-bar the boards or other piecesor strips of wood to be planed or dressed because of the frictionbetween the under side of the PlQSSGI-bdl and the board or other piecesof wood, and especially is this the case when the wood is moist or sappyor contains pitch; and, further, the pressure of the broad lower side ofthe presser-bar on the wood is, under such circumstances, liable toscratch and mar the planed surface of the board.

This inventi m has for its object to over come the difficulties referredto, and I accomplish my object by constructing the presserbar with agroove on its under side to receive a roller of steel or other suitablematerial, the said roller having bearings in adj ustableboxes fitted inor secured to the said bar and capable of rotation in said boxes, butbeing prevented from vertical movement therein.

Figure l is a top view of the presser-bar detached from theplaning-machine; Fig. 2, a longitudinal section of the presser-bar shownin Fig. l, the roller which forms. the bearingsnrface of my improvedpresser-bar being in elevation; Fig. 3, a section of Fig. 9 on line so.u, and Fig. 'i a section of Fig. 2 on line y 3 The presser-bar(designated as a whole by the letterA) is herein shown detaclied fromthe planing-machine with which it is used, it being in practicesuppmrted above the bed of the said machine in any suitable orconvenient manner as, for instance, by uprights (not shown) extendedthrough openings a at the side of the said bar. The pressenbar isprovided. with the usual lip, a and is grooved at its under side toreceive a roller, a having bearings in boxes of, herein shown as fittedsnugly in said groove and secured to the bar by screws 1', (see Fig. 2,)screwed from the under side up through the bearings of the roller intothe presser-bar. The roller of projects below the under side of the bar,as shown in Fig. 3, and as the board or other piece of wood is pushedforward by the feeding mechanism of the planing-machine it passesreadily under the bar. The roller bears upon the upper face of the wood,serving to hold the latter firmly upon the bed of the machine. The

roller a is rotated by the forward feed of the wood, and presses uponthe said wood only at the point of contact with it, thereby reducing thefriction of the bearing-surface upon the wood to a minimum, thusenabling the wood to be fed forward with the least possible expenditureof power. The friction of the ordinary bar on the wood is veryconsiderable, especially when the wood is damp or gummy or containspitch.

The presser-bar herein shown in practice adjusted vertically in the barA without chang ing the position of the presser-bar on the machine toregulate the distance between the lip of the said bar and the work bymeans of adj Listing-screws Z as, for instance, the roller may belowered from the position shown in Fig. 2 by turning the screws 1) towithdraw them from the bar, and when in the desired or adj ustedposition the screws 0 will be turned down in contact with the boxes athus firmly receiving the said boxes in adjusted. position,

the screws I) preventing theboxes and rollers from dropping down and thescrews 0 from moving upward.

hen the work being planed is thin or fragile, the roller must beadjusted with relation 5 to the lip of the plGSSGPlJfL-l, so as to fallan infinitesimal distance below the plane of the said lip, therebypreventing the trembling of the material under the action. of the knifeand consequent gouging or chipping of the roo material. By suchadjustment the wavy appearance too frequently seen in veneering and workof fine finish is entirely obviated.

I claim The lip of this 75 The resser-bar provided with the lip a Intestimony whereoflhave signed my name and grooved at its under side,combined with to this speoificationin the PIGSGH ee of two sub- 10 theroller (0, and boxes (4*, fitted in the said scribing witnesses. moveand means to adjust said boxes and v V b 111i "*1 5 voila-verticallyindependently of the presseir- HEB RX 1 C LL bar, whereby the positionof the roller with \Vitnesses: relation to the resser-bar may bechanged, .IA's. H. CHURCHILL, as and for the purpose specified.FREDERICK L. EMERY.

